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# Counting Principles – Cardinality

Cardinality is the fourth blog post in a series about Counting Principles. These principles are helpful when developing children’s number sense. It’s not enough for them to learn to count by rote, they have to develop a strong foundation of numbers and counting.

You can see the other Counting Principle blog posts here.

### What is Cardinality?

It is knowing that the last number that you said when counting is the number of objects in the set.

### Why is Cardinality important?

Developing this number sense skill is important so that students can know how many objects are in a set and can compare two or more sets.

### Activities

Counting sets of meaningful objects throughout the day will help students develop this skill. Model counting objects, then saying how many are in the set (“1,2,3 bananas. There are 3 bananas”).

Play dough mats, number puzzles, dominoes, are all great activities that will work on developing students’ cardinality skill. These blog post have some great counting ideas: number provocation, card center, math loose parts.

##### Cardinality Clip Cards

Laminate these clip cards and students can use clothespins to clip the correct number after counting the set (bonus- this works on fine motor skills too!)

If you would like to use these cards, they are a free download in my Resource Library (if you do not have he password, sign up for my newsletter and it will be sent to you):

##### Counting

If your students need more practice with their cardinality and number formations, these packs will have them practicing in so many different ways:

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